General Motors 60° V6 engine

GM 60° V6 engine

Overview
Manufacturer	General Motors
Also called	X engine
Production	1980-2010
Combustion chamber
Configuration	60° V6
Displacement	2,490 cc (152 cu in) 2,837 cc (173 cu in) 2,986 cc (182 cu in) 3,136 cc (191 cu in) 3,350 cc (204 cu in)
Cylinder bore	89 mm (3.50 in) 92 mm (3.62 in)
Piston stroke	66.7 mm (2.63 in) 76 mm (2.99 in) 80 mm (3.15 in) 84 mm (3.31 in)
Cylinder block alloy	Cast iron
Cylinder head alloy	Cast iron Aluminum
Valvetrain	Overhead valve Dual overhead cam
Combustion
Fuel system	Carburetor Throttle-body fuel injection Multi-point fuel injection Sequential multi-point fuel injection
Fuel type	Gasoline M85 E85
Oil system	Wet sump
Cooling system	Water-cooled
Chronology
Successor	GM High Value Engine Isuzu V engine (Isuzu applications only)

The General Motors 60° V6 engine family is a series of 60° V6 engines which were produced for both longitudinal and transverse applications. All of these engines are 12-valve cam-in-block or overhead valve (OHV) engines, except for the LQ1; which uses 24-valves driven by dual overhead cams (DOHC) instead. These engines vary in displacement between 2.5 and 3.4 liters and have a cast iron block and either cast iron or aluminum heads. Production of these engines began in 1980 and ended in 2005 in the U.S., with production continued in China until 2010. This engine family was the basis for the GM High Value engine family. Some refer to these engines as X engines due to first usage in the X-body cars.

This engine is in no way related to the GMC V6 engine that was designed for commercial vehicle usage.

The first generation of modern small GM 60° V6 engines featured an iron block and heads with inline valves. This "clean sheet" design was introduced in 1980 and versions were produced through 1995. Two different blocks with minor differences were developed:

The transverse engines began the 60° family in 1980. Like the rest of the Generation I engines, they were updated in 1985 with larger main journals for durability, along with multi-point fuel injection or E2SE carb and OBD I. Production of the Generation I transverse engines ended in 1986.

The 2.8 L LE2 was the first version of the 60° engine. It was a transverse version produced from 1980 through 1986 for the A-Body and X-body cars. The standard ("X-code") engine for this line, it used a 2-barrel carburetor. Output was 115 hp (86 kW) for 1980 and '81 112 hp (84 kW) for 1982-86 and 135 lb·ft (183 N·m). Bore was 89 mm (3.5 in) and stroke was 76 mm (3.0 in).

Applications:

Introduced in 1981, the 2.8 L LH7 was a High Output ("Z-code") version of the LE2 for the higher-performance X-cars like the Chevrolet Citation X-11 and higher-performance A-cars like the Pontiac 6000 STE. It still used a 2-barrel carburetor and produced 135 hp (101 kW) and 165 lb·ft (224 N·m) for 1981 and 145 lb·ft (197 N·m) for 1982-1984 versions. The LH7 was replaced after 1984 with the MFI L44.

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Wikipedia